# -*- coding: utf-8 -*-
"""
Created on Wed Jan  7 08:34:36 2026

@author: François Coulombeau
"""
import numpy as np
import matplotlib.pyplot as plt

X = np.linspace(-3,3,500)
Y1 = np.cos(X)
Y2 = 1-X**2/2+X**4/24-X**6/720

plt.plot(X,Y1)
plt.plot(X,Y2)